Unveiling the Hot Molecular Core in the Ultracompact Region with Extended Emission G12.21--0.10

Original · EN

We present a multiwavelength study of the cometary region G12.21--0.10 using the VLA and OVRO. Both radio continuum (0.3, 0.7, 2 and 3.6 cm) and spectral lines of H41α, ¹³CS(2-1) & (1-0), and NH 3(2,2) & (4,4) observations are included. We find two 3 mm continuum peaks toward G12.21--0.10, one of them is spatially coincident with the UC H II region, while the other coincides spatially with a molecular clump. We also find that the 0.7, 2 and 3.6 cm continuum and H41α line are only detected toward the UC H II region, while the ¹³CS, and NH 3 is spatially associated with the molecular clump. Based on the morphology, kinetic temperature (86 K), volumetric density (1.5×10⁶ cm⁻³) and linear size (0.22 pc) of the molecular clump, we suggest this source is consistent with a hot molecular core.